Brook lamprey · Lampetra planeri

Brook lamprey in the River Chess

Largest measured brook lamprey: 15.5 cm

The largest brook lamprey measured in Environment Agency surveys of the River Chess was 15.5 cm, recorded at Scotsbridge Mill on 11 May 2004.

Across 35 measured brook lamprey, the median measured length was 11 cm.

Surveyors recorded weights for 10 brook lamprey. The median was 0.2 oz (0.005 kg) and the largest recorded weight was 0.2 oz (0.005 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Chess.

See brook lamprey records across England →

Most recent observation9 May 2017Scotsbridge Mill · 20 fish

Largest measured brook lamprey: 15.5 cm
Median length: 11 cm
Fish measured: 35
Survey locations: 1

Individual EA measurements

Largest measured brook lamprey

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

Length	Survey date	Survey location	Survey ID
15.5 cm	11 May 2004	Scotsbridge Mill	81246
15.2 cm	9 Jul 2003	Scotsbridge Mill	76371
14 cm	11 May 2004	Scotsbridge Mill	81246
13.5 cm	9 May 2017	Scotsbridge Mill	150394
13.2 cm	9 May 2017	Scotsbridge Mill	150394
13.2 cm	9 Jul 2003	Scotsbridge Mill	76371
13.1 cm	9 May 2017	Scotsbridge Mill	150394
12.8 cm	11 May 2004	Scotsbridge Mill	81246
12.5 cm	5 May 2005	Scotsbridge Mill	84778
12.2 cm	9 May 2017	Scotsbridge Mill	150394

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where brook lamprey were found

Each point marks a survey location with at least one brook lamprey record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyed	First recorded	Last recorded	Visits finding brook lamprey
Scotsbridge Mill	9 Jul 2003	9 May 2017	5

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

2003–2017

Survey records by year

Each bar shows how many survey visits recorded brook lamprey that year.

103

104

105

006

007

008

009

010

111

012

013

014

015

016

117

Fish measured by surveyors

Measured length distribution

See how the 35 measured fish were spread across different length ranges.

Smallest: 3.5 cm
Lower quarter: 9 cm
Median: 11 cm
Upper quarter: 12.4 cm
Largest: 15.5 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 10 brook lamprey. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.005 kg)
Lower quarter: 0.2 oz (0.005 kg)
Median: 0.2 oz (0.005 kg)
Upper quarter: 0.2 oz (0.005 kg)
Heaviest: 0.2 oz (0.005 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Chess

Compare other species with enough survey and measurement data for a detailed page.

Brown / sea trout Bullhead Stone loach Minnow 3-spined stickleback Grayling

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →